What do you add to 5 1/7 to make 9

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Landon wrote that 3−2.6=4. which statement about his answer is true?

Which shows how to solve the equation 3/4x=6 for x in one step?